问题 单项选择题

在烟气泄漏量与所保护空间的体积或流进、流出该空间的净化空气流率相比较小时,一般采用的烟气控制方法是( )。

A.非火源区的烟气稀释

B.加压控制

C.空气流

D.浮力

答案

参考答案:A

阅读理解

阅读理解。

     In North America, people are always in a hurry. Children usually have many sports activities after

school. Parents often work late every day. More than 50% of women have full-time jobs. Most families

usually don't eat meals together because they have little time to cook meals. So fast food is popular in

North America.

     People usually buy fast food from restaurant chains like McDonald's and KFC. Fast food is such

food as pizza, sandwiches and fried chicken. It's convenient and people can save a lot of time, but it's

not very healthy. There are many chain shops all over the world.

     Fast food is popular in many countries, but not everyone is happy about it. A group of people in

Italy want to fight against it. They don't want any more fast-food restaurant in their country. They also

plan to fight against fast food around the world.

1. Children in North America are usually busy ____ after school.     

A. with their homework    

B. with sports activities

C. doing shopping         

D. doing chores

2. Fast food is popular in North America because ____.

A. it's convenient and people can save time

B. it's very healthy

C. it's very cheap

D. people in North America are too lazy to make food

3. The following food is fast food EXCEPT (除了) ____.    

A. sandwiches    

B. fried chicken  

C. noodles    

D. pizza

4. What does the underlined (划线) word "chain" mean in Chinese? 

A. 链子    

B. 连锁店    

C. 一系列    

D. 锁链

5. Why do people in Italy fight against fast food?   

A. They have little money to buy it.

B. They are tired of it.

C. It's not delicious.

D. They think it's dad for people's health.

实验题